Electric heater



Aug. 14', 192s.

" J. L. SHROYER- ELECTRIC HEATER Filed Dc. 22, 1925 Patented Aug. 14, 1928.

UNITED STATES PATENT @FICE JACOB L. SHROYER, OE OAK PARK, ILLINOIS, SSIGNOR TO EDISON ELECTRIC Ali- PLIANCE COMPANY, INCORPORATED, OF CHICAGO, ILLINOIS, VA CORPORATION YOF NEW YORK.

nLnoTnrc HEATER.

Application filed'Deceinber 22, 1325. Serial No. 77,102.

My invention relates to electric heaters and. has for its object the provision of a simple and ruggedelectric heater which may be adjusted.

More particularly my invention relates to electric heaters for various objects of indefinite height under which the heater may be placed and then adjusted as desired. My invention has particular application to electric heaters for colfee percolators and the like.

For a more complete understanding of my invention reference should be had to the accompanying drawing in which Fig. 1 is a vertical sectional view of an electric heater embodying my invention, while Fig. 2 is a fragmentary perspective view of reduced size showing the application of the heater to an electric percolator.

Referring to the drawing, in carrying out my invention in one form I provide a base member 10 which is hollow, i. e., it is pro vided with an internal cavity 11. As shown, the base member is smaller atthe top, it being substantially cone shaped and at the apex of the cone it is provided with a threaded vertical bore 12 into which is screwed a threaded tubular member 13 which may be a! length of pipe. The tubular member 13 extends upward in -a substantially vertical position and it is provided with external threads throughout itsentire length so that it may beradjusted vertically by screwing it into or out of the base member. it in its adjusted position.

On the upper end of the tubular member 13 is mounted a suitable heating. unitv 15. This heating unit comprises a disk shaped member 16, made of a suitable heat refractory electrically insulating material, which rests in a substantially horizontal position on a metallic supporting member 17. The supporting member 17 is providedwith a threaded central bore 18 into which the upper end of the tubular member 13 is screwedand-secured by means of lock nuts 19 and 2O on opposite sides of the supporting member. The upper surface of the insulating member 16 is provided with a groove 21 in which a helically shaped resistance conductor 22 is placed. The arrangement of the'grooveA 21 and the resistance conductor in t-he insulating member 16 is preferably substantially A lock nut 14 is providedV for securing Y.

as ldescribed and claimed in Patent No. 1,522,206 to Rankin, dated January 6, 1925.

Around the periphery of the supporting member 17 is an upwardly turned flange 23 on the upper edge of which the member 16 rests. `By means of this flange Aa space 24 is provided underneath the member 16 through which connecting leads 25, 26 and Thev 27 are led tothe resistance conductor. resistance conductor is preferably in -one piece, the leads 25 and 27 going to the ends andthe lead 26 being connected to a central point thereof. The leads are passed downward through the tubular member 13 into the hollow base member 10 where connection is made with conductors 28 and 29 leading to a suitable electrical supply circuit. Electrically insulating bushings 30 and 31 vare i provided at each end of the tubular member,

and a bushing 32 is also provided in the base member for the conductors 23 and 29.'

By means of the lead 26 leading to a central point of the resistance conductor the connections with thesupply circuit' may be varied to give different heats. This maybe effected by meansof a suitable switch 33 of any well known form mounted on the baseA 1,0.` This switch is operated to various posi tions by means of a knob 34- and isso arranged that for high heat the leadV 26 may be connected to one side of the supply circuit, the leads 25 and 27 being connected to the opposite side, whereby the two halves of the resist-ance conductor are connected inl v parallel, while for mediumhea" the lead 26 and one of the other two leads will be connected to the supply source, whereby one` In'F ig. 2 is illustrated one application of my invention, this application being to a` coffee percclator. The heater is placed underneath the percolator and the height of the heating unit `adjusted as desired by adjusting the tubular member 13 with relation to the base, after which the tubular member is locked by the lock nut 141. A suitable aperturewill preferably be provided in the base of the perclator to give access to the switch 33.

Vhile I have described my invention as embodied in concrete form and as operating in a specific manner rin accordance with the provisions of the Patent Statutes, it should beunderstood that I do not limitmyinvention "theretdin'ee various odieatons thereof ,"Will 'suggest `themsel'ves to "those skilled in the art without departing-rein the spirit of my invention, the scope of'which is set forth in the annexed claim,V o

VJ hat I claim as newdand desire to secure byLettersPatent of the United States-is:

An electric @heater Comprising va ho'llow basev provided withy central and rside aperytures, ya tubular -inember threaded :in said central aperture v so as to be vertically adjustable relatively to seid hollow `basera eircular supporting member provided with a peripheral upwardly turned -flange and a eentral'aperture, said tubular member being threaded to said'eiroular supporting member in said aperture, aloeknut threaded on sadtubular member for engagement with said YCircular supporting member, a disk- .shaped heat refractory support resting on 'said `flange 1n spaced relatlon'with sa1'd`"su`p porting 'member, 'a heating resistance conduetor mounted on said heat refractory sup- `port, eonneeting leads extending through a side aperture iii-said base upward through said tubular support and through the space between vksaid V heat refractory support fnnd Y In witness whereof I lhave -hereunto set* lmy handthis l9fday of December,r1925.

JACOB L sHRoYE-R. 

